Switch



J. A. SMITH May 27, 1 930.

SWITCH Filed Dec 30, 1925 attozmew Patented May 27, 1930 UNITED STATES PATENT OFFICE JOHN A. SMITH, OF BELLEVUE, KENTUCEIY, ASSIGYOR TO THE UNITED STATES ELEC- TRICAL TOOL COMPANY, OF CINCINEIATI, OHIO, CORPORATION OF OHIO SVITGH Application filed December 30, Serial No. 78,262.

This invention relates to electric switch and a pplied is designed as electric motor driven motor cont-rolling mechanism priii'iariiy for hand tool, and comprises a handle 1, a casing motor driven hand tools, to prevent a motor 2 as a suitable moun or housing for a reversing control without advancedly cutting motor. The spindle is in suitable geared 5 off the power to the motor or reversely preconnection with the motor, the deti iii of this venting a power control unless the motor or structure not being shown herein. The tool is reversing control has been moved to its full further pro "ided with a hollow handle or controlling limits. grip portion l within which is mounted a porn The device finds application in electric or controlled switch 5 of the snap type. This 10 tools, and herein has been shown applied to switch comprises a spring contact member 6 an electric hand tool in which two switches having a slot therein engaged with a pin u on are provided, one for controlling power to one arm a le've" T pivoted to the handle. the motor and the other for reversing conupper end of the lever is en 'aa'ed in a I i b 1 trol of the motor. In tools of this CltlSS it 1:5 notch 8 I the reciprocal switch control inein 15 desirable to prevent actuation of the reversher 9 mounted crosswise of the grip portion.

mg switch while the power is on, or in other This control member in one of switch cenwords while the power controlling switch is troi positions pro ects outwardly bclosed. wall or the hollow hain'ile, and in this ii The main feature of the invention resides this 131018Ct111g position corresponos to a 20 in the provision of a switch having an oscilclosed switch. The general structure of the latable control element adapted for obtaining switcii is ell known and therefore is not decontrol action at opposite limits of motion, scribed in iiurther detail. the control element of this switch being inter- Mount-en upon the top of the handle within lockingly engageable or interceptable by the a suitable casing 10 IS a reversing ltCll,

25 controlling element as a reciprocating push comprising pairs of switch contacts 12. 14, button of a second control element of a seceight in number, and suitably connected with end switch, to lock the first element at either motor and power swi ch, for electrical conof its control limits, and to prevent movement troi. A rotatable shatt 15 is loc ted between of the second control element when the the contacts or lingers and said member has 30 element is at an interii'iediate position. suitable insulated contact plates l6, 18,

Other ob eets and certain advantages will adapted to contact rspective pairs of fingers be more fully set forth in the descrip ion of alternately, the member rotated to switch the accompanying drawings forming a part controlling limits or p sitions. This control of this specification, in which: member is further provided with a seamen Figure 1 is a side elevation of an electric plate 20 as a quadrant having spaced openhand tool showing my invention applied inas 21,22, therein concentric with its rotative thereto, axis, and inthis instance lying at the ex- Fignre 2 a fragmentary detail vertical tremity of ri 'iit singularly related radii. This section showing; the construction oi the powsegmentis auaptedtobe swung; through angles 40 or snap switch, and of in terlocliing relato regis' either onewith the axis 90 tion with the control member of the i'eversreciprocati i of the transiatable member ing' switch. to permit the projecting end of this member F igure 3 is an end View of the handle of to traverse an opening and lock the segment the tool, showing the interlocked relation of against rotation at either of its limits, or to 45 the switch control members. impinge the segment when at intermediate Figure i is a horizontal section on line 4- positions and prevent closing of the power of Figure 2 through the reversing switch. switch. In this instance the segment is adapt- Figure 5 is a cross section on line 55 of ed to be locked by the projecting end 25 of Figure 2 also through the reversing switch. the translatable member of the power switch 50 The tool to which the invention is shown when this switch is closed, or, in other words,

when the tool is operating. The rotative movement of the plate 22 is limited by stops 20, 20, respectively to register openings 21, 22 with the end 25 01 the translatable ment ber.

Thus I provide a first switch having a control element movable to alternate switch control positions, and a second switch having a switch control element movable to a switch control position across the path of movement of the said first element, so that each element is adapted to intercept the control path of the other, such that the first element prevents control movement or" the sec end when said first is at a position interme diate its control limits, and such that the second control element when in one -.control position prevents movement of the first element to a second switch control position.

The segment is of skeleton formation but provides a solid flat circular portion 28 extending between the two openings, and aligned with the axis of translation of the translatable member so that said member will impinge the segment to prevent its trans lation when the segment is at an intermediate position. This impingement or intercepting relation between the rotary switch control element and the translatable switch control element, is such that the translation of the latter element for closing the switch is prevented unless the rotary element is at one of its switch controlling limits.

Although the invention is applied to a tool of a specifictype, and is adapted for interlocking the switch control elements in one specific manner, it will be readily understood that the principles ot the interlock may be applied between the switch controlling elements of switches adapted tor controlling power is on.

2. A controlling mechanism for an electric motor, comprising a reversing switch, power control switch, a segmental rotatable control lever for the reversing switch having spaced concentric openings therein, a trans latable control lever for the power switch, said segmental reversing control lever moving across the path of movement of thetranslat-able member and traversed thereby when the motor power is on to lock the reversing switch lever against movement.

3. A controlling mechanism for an electric motor, comprising, a reversing switch, a power control switch, a swinging lever for said reversing switch, a translatable control element for said power switch, said control element adapted to traverse said swinging lever for preventing movement thereof when the translatable control element is in closed power connecting position.

4:. A controlling mechanism for a portable electric motor having a'handle, comprising, a direction control switch and a power control switch mounted in said handle, a rotatable operable lever for said direction control switch and a translatable lever for said power control switch, said translat ble con trol lever adapted to traverse apertures in said rotatable operating lever for preventing movement or" said direction control switch.

5. A controlling mechanism for an electric motor, comprising, a rotatable direction control switch, a segmental operating lever for said rotatable switch having apertures formed in its outer corners, a power control switch, a translatable element for operating said power control switch, said apertures adapted to be registered with and traversed by said translatable element, stops adapted to limit swinging movement of the segmental lever in either direction of motor control and said stops also disposed to alternately align said apertures with said translatable element whereby the translatable element in a motor starting position is adapted to traverse an aperture and prevent movement of the direction control switch.

6. Switch mechanism, comprising, a direction switch and a power switch, control elements for said switches moving in transverse and intersecting paths relative to each other, a locking member carried by the control element for the power switch, and two locking members carried by the control element for 1-:

the direction switch, said last mentioned locking members adapted to cooperate with the first mentioned locking member so that the power switch in on position locks the direction switch in either forward or reverse position.

In witness whereof, I hereunto subscribe my name.

' JOHN A. SMITH. 

